If $x > 0$ and $x^y = e^{x-y}$,then $\frac{dy}{dx}$ is equal to

  • A
    $\frac{1}{(1+\log x)^2}$
  • B
    $\frac{\log x}{(1+\log x)^2}$
  • C
    $\left(\frac{\log x}{1+\log x}\right)^2$
  • D
    $\frac{(\log x)^2}{1+\log x}$

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